This concept of "not enough coins for the economy to run" / hoarding is bad comes from back when there was metal coinage. When a silver Spanish real could only be divided into pieces of eight, and one bit (1/8th) was more valuable than most small items, then yes -- that money lost its divisibility property, and no longer worked well as a currency. And economic repercussions occurred.

There's a couple orders of magnitude in price that would need to occur before the divisibility of 1 sat is something that the market might find useful.